diff --git a/builder/proxmox/common/config.go b/builder/proxmox/common/config.go
index 1428345f9..2e3083b52 100644
--- a/builder/proxmox/common/config.go
+++ b/builder/proxmox/common/config.go
@@ -39,6 +39,7 @@ type Config struct {
 	VMName string `mapstructure:"vm_name"`
 	VMID   int    `mapstructure:"vm_id"`
 
+	Boot           string       `mapstructure:"boot"`
 	Memory         int          `mapstructure:"memory"`
 	Cores          int          `mapstructure:"cores"`
 	CPUType        string       `mapstructure:"cpu_type"`
diff --git a/builder/proxmox/common/step_start_vm.go b/builder/proxmox/common/step_start_vm.go
index 0e92334fb..d5877a6a2 100644
--- a/builder/proxmox/common/step_start_vm.go
+++ b/builder/proxmox/common/step_start_vm.go
@@ -43,7 +43,7 @@ func (s *stepStartVM) Run(ctx context.Context, state multistep.StateBag) multist
 		Name:         c.VMName,
 		Agent:        agent,
 		QemuKVM:      kvm,
-		Boot:         "cdn", // Boot priority, c:CDROM -> d:Disk -> n:Network
+		Boot:         c.Boot, // Boot priority, example: "order=virtio0;ide2;net0", virtio0:Disk0 -> ide0:CDROM -> net0:Network
 		QemuCpu:      c.CPUType,
 		Description:  "Packer ephemeral build VM",
 		Memory:       c.Memory,